| http://www.w3.org/ns/prov#value | - the substrate is at least partially a gold film and the group, which reacts with the metal surface includes a thiol, sulfide or disulfide such as: Y--S--R.sup.2--X.sup.2 (2) in which R.sup.2 is a linking group between sulfur and X.sup.2, and X.sup.2 is a
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