reflection-absorption at grazing incidence

https://doi.org/10.1351/goldbook.08673
Reflection-absorption with very thin layers of an absorbing material on a metallic substrate and the angle of incidence between \(\pu{70\!^{\circ}}\) and \(\pu{90\!^{\circ}}\).
Note:
As the incident radiation beam travels nearly parallel to the sample surface, the electric vector of the radiation is then either parallel or nearly perpendicular to the surface.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 762 [Terms] [Paper]