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Figure 2
(a) Diagram of the transition from the Laue condition to the Bragg condition during rotation of the crystal by φ around [\bf h]: [\varphi \ge \varphi _0'], [{\gamma _0} \ge 0]; [\varphi _0' \le \varphi \le \varphi _{0,k}'] corresponds to the simultaneous total external reflection of the incident beam [{\bf k}_0^{\rm a}] from the surface and diffraction from the (hkl) plane. (b) Skew-symmetric case of X-ray diffraction (this example shows a CdTe crystal, Cu [{K{\alpha _{1,2}}}] radiation): [\varphi = {90}]°, [{\gamma _0} = | {{\gamma _h}} |]; surface is (111), diffracting plane is (115).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 50| Part 3| June 2017| Pages 727-733
https://doi.org/10.1107/S1600576717007208
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