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. 2020 Oct 16;13(20):4605. doi: 10.3390/ma13204605

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(Color online) Schematic of the propagation problem. The incident wave-vector $k^{i n c}$ has azimuth and elevation angles $ψ$ (yellow) and $θ$ (light purple) respectively.