a polymer outer layer coupled to {HEAD ~ the first metallic material} opposite {TAIL ~ the substrate}, and 
opposite
a polymer outer layer coupled to { HEAD ~ the first metallic material } opposite { TAIL ~ the substrate } , and
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH