# General Parameters

General Parameters — MC Grating documentation for Chandezon Crossed. General Maximum Order of Field Decomposition defines 2*OrderX+1 and 2*OrderY+1 of…

Canonical: https://mcgrating.com/docs/chandezon-crossed/general.html


Written by Nikolay M. LyndinLast revised 2016-06-10

This documentation was written for releases up to 2018 and is being revised. Some dialogs have changed since. If something does not match what you see, write to [mc@mcgrating.com](mailto:mc@mcgrating.com).

**General**

- ***Maximum Order of Field Decomposition*** defines 2**OrderX*+1 and 2**OrderY*+1 of Fourier components along* X* and *Y *directions (the total number of components is the product of these values). The *OrderX* and *OrderY* values should be adequate to the number of appropriate Rayleigh diffraction orders in every layer. There is a possibility of automatic fixing of this problem (see page ***Options***).
 The Rayleigh diffracted order indexes are calculated in positive directions of *X* and *Y *axes.
- ***Wavelength***, measurement unit is *nm*.
- ***Polarization. ***The polarization state is defined by two electric field vectors ***Es*** and ***Ep*.** The wave vector ***k*** of the incident wave and these electric field vectors are mutually orthogonal. Vector ***Es*** is parallel the *X-Y* plane and vector ***Ep*** is parallel the incidence plane. Amplitudes of these vectors are defined by the ***State*** polarization angle and the phase difference between them is defined by the ***Phase*** angle.
 Angles measurement unit is *degrees*.
 Under exactly normal incidence it is impossible to define the incidence plane unambiguously. In this case depending on a coordinate system the software uses the following rules.
 - For the Plane base coordinate system a plane of AngleI changing is considered as the incident plane.
 - For the Grating base coordinate system a X-Z plane is considered as the incident plane.
- ***Incidence Angles,*** the angles definition is explained in the ***Structure Geometry*** picture. In the conical mount version the incident wave orientation is defined by two angles (definition depends on ***Coordinate System***). Theirs meaning are obvious from the pictures presented at the same page.
 Measurement unit is *degrees.*
- ***Method*** defines the calculation method Classic or Extended. If classic method is selected then on this control exit a zero interface will be applied to all interfaces. *
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From the in-application help of Chandezon Crossed, documented through 2018. If you publish results computed with MC Grating, see [how to cite it](https://mcgrating.com/references.html#cite).