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Figure 2
(a) The unit cell of α-iPP. (b) The phase difference between adjacent electrons on a (00l) crystalline plane parallel to the incident X-rays or (c) having an intersection angle θi with the incident X-rays.

IUCrJ
Volume 6| Part 5| September 2019| Pages 968-983
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519011035