Reflectivities for Laue and Bragg geometries, top and bottom, respectively, as evaluated by the Dynamical theory of diffraction for the absorption-less case. The flat top of the peak in Bragg geometry is the so-called Darwin Plateau.

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Reflectivities for Laue and Bragg geometries, top and bottom, respectively, as evaluated by the Dynamical theory of diffraction for the absorption-less case. The flat top of the peak in Bragg geometry is the so-called Darwin Plateau.