k-point grid. Previous experimental characterization showed that as-synthesized delafossite nanosheets have at least seven O-M -O layers, which would be computationally expensive for the supercell compositions that we are investigating. Therefore, the delafossite surface slabs used here include four total metal oxide layers (O-M -O), like the NMC surfaces in Refs., of which the two interior and two exterior layers are related by inversion symmetry. The (001)