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Illustration of different positions of the image plane zim on the Au {1 1 1} surface in contact with peptide A3 and water. Corresponding mirror images are shaded in pink. The image plane is shown (a) above the interface edge, (b) at the interface edge (approx. 0.1 Å above the jellium edge), (c) near the first layer of metal atoms, and (d) far below the interface edge, equal to zero image potential as employed in equation (2.6).
