Abstract
A method is presented for applying the concept of an exchange-correlation electric field due to the exchange-correlation hole when determining the approximated nonlocal-exchange-correlation (NLXC) potential in the surface region of a metal. Our approximation for the electron-hole separation based on the theory is proposed by Serena, Soler, and Garci\ifmmode\acute\else\textasciiacute\fi{}a. The NLXC potential obtained shows the correct classical imagelike limit outside the metal without any extra boundary conditions. The method presented is also applied to determining the NLXC potential of a one-dimensional metal-vacuum-metal (MVM) interface barrier. This method gives the physical background of the approach for a MVM barrier suggested by Garci\ifmmode\acute\else\textasciiacute\fi{}a and incorporates the classical multi-image potential in the NLXC potential of a MVM junction.
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