The RadiCoat stainless steel-4-(Chloromethyl)benzene surface coating is a multilayer film on stainless steel (SS304) consisting of 4-(Chloromethyl)benzene groups, electrochemically immobilized through reduction of 4-(Chloromethyl)benzenediazonium tetrafluoroborate. The multiple surface Chloromethylbenzene groups makes the surface hydrophobic. In addition, these electrophilic groups may serve reactive moieties for nucleophilic substitution reactions to chemically immobilize e.g. biological markers or chemical functional groups. As an example, RadiCoat stainless steel-4-(Chloromethyl)benzene has been used for immobilization of pyridine units (New J. Chem. 2005, 29, 659–666). RadiCoat stainless steel- 4-(Chloromethyl)benzene surface films are 5-7 nm thick and highly uniform.