Figure 2
From: Defluorination and adsorption of tetrafluoroethylene (TFE) on TiO2(110) and Cr2O3(0001)

Top view of TiO2(110) (left panel) and Cr2O3(0001) (right panel), with coordination numbers of surface and subsurface atoms indicated. Note the lower coordination number of the surface Cr atoms as compared to the surface Ti atoms.