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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Binding energy EB of CuPc adsorbed (a) on Au(111) and (b) on Ag(111) surfaces, as a function of the vertical distance, d. For determining d, the vertical positions of the carbon atoms in the CuPc molecules and the metal atoms in the relaxed top metal layer are averaged.