Theoretical and experimental analysis of diffraction by a lamellar amplitude multilayer grating, in conical mountings, for the X-ray domain

In this article, we consider the diffraction of an electromagnetic wave by a lamellar amplitude multilayer grating (LAMG), in conical mountings, when the incident wave vector is not in a plane perpendicular to the grooves. A modal expansion technique based on Bloch's theorem is used with an R-recursive propagation scheme. We compare the zeroth order diffraction efficiency measurements with the theoretical results.