0.3 eV) and also correlates stepped surfaces. It therefore provides a greater accuracy and generality as a descriptor for the prediction of U PZC . We furthermore find these descriptors to also hold for the prediction of the U PZC of overlayer (mixed metal) surfaces. Finally, we evaluate electronic and orientational contributions of ∆φ. In contrast to previous findings on flat surfaces, we find the latter contribution to be especially relevant for stepped (211) surfaces. While a larger orientational contribution may arise from a different simulation setup, it also highlights the importance of the water geometry in determining the U PZC .