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Layer is a keyword indicating the layer assignment for the atom, one of High, Medium and Low. The other optional parameters specify how the atoms located at a layer boundary are to be treated. You use link-atom to specify the atom with which to replace the current atom (it can include atom type and partial charge and other parameters). Link atoms are necessary when covalent bonding exists between atoms in different layers in order to saturate the (otherwise) dangling bonds. 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