{HEAD ~ A layer} of {TAIL ~ copper} 5 to 50 angstroms thick is deposited on the etched and treated surface and covered by a different metal 
of
{ HEAD ~ A layer } of { TAIL ~ copper } 5 to 50 angstroms thick is deposited on the etched and treated surface and covered by a different metal
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH