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Figure 3
Revision of refraction parameters: direct and reflected beams are indicated by stars (green). Often tails of the reflected beam can be discerned close to the beamstop. A small increase in background scattering intensity indicates the position of the horizon (solid yellow line). Both reflected-beam tails and horizon are solely dependent on the incident angle. The Yoneda band, the band of enhanced scattering intensity between the critical angles of the film and the substrate (Smilgies, 2022View full citation), helps to revise the optical parameters. The film Yoneda line is found at the first maximum of the scattering intensity coming from the horizon (solid red line). The substrate Yoneda line appears often only as a shoulder (dashed red line). Usually a calculation from the substrate optical constants (CXRO, 2021View full citation) results in a good fit. Reproduced from Smilgies (2025View full citation) under the terms of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 59| Part 3| June 2026| Pages 960-967
https://doi.org/10.1107/S1600576726002608
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