we see that at this potential the first H peak is higher near the surface. Thus, the water molecules in this first layer are pointing to the surface ('one-H-down') and possibly binding to it, and this H atom creates a chain with the other waters so that an ordered structure for dipole alignment is made. At -0.04 V, the water molecules take several planes, but the dipole is distributed around 60 It is possible to directly compare our results to the ones of Ref. Comparing the results for the water bisector angle and ours for the dipole moments, we see that at low potentials there is a peak around 140 • , then a shift and broadening of this peak around 120 • and a large set of angles due to the small net-orientation dipole at 0.04 V vs SHE. This behavior has also been described with an analogous analysis on Pt(111). Before the PZC, the water orients to be 'H-down' and at higher potentials, after the PZC, the water molecules reverse ('H-up water)' and we observe peaks around 60 • .