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![[Figure 4]](xx5087fig4mag.jpg)
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Figure 4
The local exit angle αf for a (a) convex (R < 0) and (b) concave (R > 0) sample. Red arrows indicate the incoming beam and the green arrow represents one ray of the scattered signal. The dashed black line symbolizes the flat sample and the curved sample is drawn as a grey solid line. The local scale of the exit angles αf is defined with respect to the tangent at the given point X. The coordinate system used for parametrization of the sample surface coordinates with respect to the detector is indicated; its origin is at the centre of the flat sample (  ). In the case of a concave sample, there is always a fraction of the signal (αf < γ) that does not reach the detector. It is marked in grey in (b). |
![[Figure 4]](xx5087fig4.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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