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Dark-field transmission electron microscopy (TEM) images of a 24-nm thick BFO film on GSO substrate taken with near two beam (a) g = 1100 and (b) g = 1100; (c) a schematic of domain structures in (a) and (b); (d) dark-field image near [001]o zone axis using g = 010c. (Reprinted with permission from [57]. Copyright 2013 American Institute of Physics)
