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Figure 3
(a) Diffraction from a periodic, fibrous structure is limited to layer planes spaced at distances reciprocal to the axial repeat of the fiber. The equator is indexed as l = 0, the first layer line as l = 1 and so on. For a cross-β structure the axial repeat is ∼4.7 Å. When the fibrous structures are completely disoriented, the fiber pattern is spherically averaged in reciprocal space (b), giving rise to a diffraction pattern that is circularly symmetric (c). The disorientation spreads the two-dimensional layer planes (including the equator) onto three-dimensional surfaces.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 6| December 2022| Pages 1562-1571
https://doi.org/10.1107/S1600576722009955
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