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Figure 1
The influence of incident angle on the scattering intensity of a crystal plane at (a) 2θ = 30°, (b) q = 0.5 nm−1 and (c) q = 1 µm−1. Insets in (a) and (b) show the change of scattering intensity near θi = 15° and q = 0 nm−1, respectively. (d) Illustrations for lamellar crystals, which have significant contributions to scattering in WAXD, SAXS or SALS. (e) The diffraction mechanism in WAXD. (f) An illustration of the scattering of the interfacial electrons involved in the evanescent wave.

IUCrJ
Volume 8| Part 4| July 2021| Pages 595-607
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521003821