To compute γ sl , F solv , and W ad , the free energies of formation of the liquid-vacuum and solid-vacuum interfaces were needed as these were present in our finite DFT model setups. To obtain the thermodynamic quantities for our target system, the experimental solid-liquid interface alone, these contributions need to be removed surface solvation (F solv ) and metalwater interface (γ sl ) free energies as well as the work of adhesion (W ad ). This was accomplished by computing the free energies F lv and F sv and the corresponding surface tensions γ lv and γ sv . An additional complication for such referencing arises due to the frozen base layers of the metal slabs, which required appropriate treatment detailed in SM, Equations (S4)-(S5).