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(a) Schematic representation of vertically oriented layered materials grown on top of a substrate, where we indicate the directions corresponding to the in- and out-of-plane cross sections. (b, c) Illustrations representing the specimen embedded in the cured epoxy block for in- and out-of-plane configurations, respectively. (d, e) Optical microscope images of the trimmed top of the epoxy block for out-of-plane and in-plane configurations, respectively.
