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i DFT-computed electronic charge densities, ii DFT-relaxed equilibrium structure, and iii DPC-4DSTEM reconstructed charge density map for a four-layer FeO-like complexions at the Fe/Fe 3 O 4 interface. The relaxed DFT structure of the interface is presented as a bridging sketch between the two charge density maps. DFT: Density functional theory. DPC: differential phase contrast imaging, conducted in a scanning transmission electron microscope.

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