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Figure 2
Description of the scattering vector and the preferred orientation vector in the sample frame. The scattering plane appears in gray in the figure. The preferred orientation vector [[\bf{HKL}]] is defined by the azimuthal and polar angles [\varphi] and [\chi], respectively, in the [{\bf X}_{\rm S}{\bf Y}_{\rm S}{\bf Z}_{\rm S}] frame. In asymmetric coplanar diffraction conditions, the scattering vector [{\bf q}_{hkl}}] is not parallel to [{\bf Z}_{\rm S}}]. In glancing incidence, the scattering vector does not possess a component along [{\bf X}_{\rm S}}]. In grazing incidence, this component is non-null. The angle between [{\bf q}_{hkl}}] and [[\bf{HKL}]] is denoted by [\rho] in this frame.

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