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XRD patterns of the epitaxial FeSe film grown on the STO (001) substrate. (A) Out-of-plane XRD pattern. (B) In-plane ϕ-scans of STO 200 (Bottom) and FeSe 200 (Top) diffractions. These results indicate that the FeSe film grows heteroepitaxially on STO with the epitaxial relationship of [001] FeSe || [001] STO for out-of-plane and [100] FeSe || [100] STO for in-plane.
