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. 2020 Mar 20;13(6):1413. doi: 10.3390/ma13061413

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© 2020 by the author.

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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(a) HRTEM image of a caffeine (CAF) glutaric acid (GLA) polytype II [5] particle along with (b) the relevant diffractogram (reprinted by courtesy from Hasa et al. [5]).