FIELD: X-ray equipment, in particular, X-ray spectrometers. SUBSTANCE: device has substrate which is covered with structure of alternating layers of at least two materials of different electromagnetic permeability. Said structure of layers is cut at angle to surface. Roughness of substrate is greater than $$$, where h is period of structure. Diffraction pattern cut surface has either complex shape or concavity. Substrate shape is concave. EFFECT: increased functional capabilities. 4 cl, 1 dwg
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