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Figure 2
(a) The stacking of two binary zone plates in order to obtain an effective four-level profile. (b) Cross section of a zone in the case of stacking two binary zone plates to obtain a four-level profile and (c) stacking a three-level zone plate with a binary zone plate to obtain an effective six-level profile. The zone width is always the half-pitch, regardless of the number of steps.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 3| May 2014| Pages 497-501
https://doi.org/10.1107/S1600577514003403
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