In analogy to our previous work , we henceforth focus the attention only on the screening response by interfacial water, which is analyzed by the induced electrostatic potential drops ∆ϕ w-interface due to interfacial water only and as evaluated by removing all but interfacial water from the biased MD trajectories, and determining the induced interfacial potential drops without applied bias. While ∆ϕ w-interface is fully determined from the reorientation of water dipoles ∆ϕ w-interface = ∆ϕ orientation for the FF case (Fig. ), the DFT simulations exhibit in addition an important charge transfer (CT) related component with ∆ϕ w-interface = ∆ϕ orientation + ∆ϕ CT (Figs. and). As highlighted in previous work , ∆ϕ CT is on the one hand important to understand the work function difference between Pt(111) in vacuum and in water aka the PZC. On the other hand, its effect remains largely invariant with bias such that it has only a marginal influence on the overall capacitance.