Symmetry-preserving mean field theory for electrostatics at interfaces.

We derive an instantaneous symmetry-preserving mean field equation relating the long-ranged component of the intermolecular interaction to an effective single particle potential. We verify the efficiency and accuracy of the symmetry-preserving mean field approach to treat complex nonuniform electrostatics and foresee its application to study self-assembly and disassembly processes at interfaces in many computer simulations.