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Figure 2
Illustration of diffraction related quantities. h is the reciprocal vector of the diffraction, θB is the Bragg angle, φ is the asymmetry angle, and sparallel and sperp are coordinate axes parallel and perpendicular to h. x and z belong to the Cartesian coordinate system presented in Fig. 1[link].

IUCrJ
Volume 8| Part 1| January 2021| Pages 102-115
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520014165