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Figure 3
Schematic description of the sample and the hkl frames. For each hkl reflection, [{\bf Z}_{\rm L}] is parallel to the scattering vector [{\bf q}_{hkl}}]. [{\bf X}_{\rm L}], normal to the scattering plane, remains parallel to [{\bf X}_{\rm S}]. [{\bf Y}_{\rm L}] lies on the scattering plane in a general position. In Bragg–Brentano geometry, [\omega_{hkl}] is null for all reflections and the two frames are identical. As clearly displayed in Fig. 2[link], the [\omega_{hkl} {\bf X}_{\rm S}] rotation allows the transformation of the sample frame into the hkl frame.

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