After thermal equilibration, we evaluate the average potential and average excess-electrons values. By using the relation C =< Q > / < Φ >, we estimate the EDL capacitance C edl , and the potential at which the SJM adds no charge Φ ne=0 to the interfaces by linear regression. In the case of the simulations with pure water and with the hydroxides, we relate Φ ne=0 to the PZC of the interface. We are particularly interested in estimating these two values because they are experimentally measurable.