The substrate consists of a metal or {HEAD ~ an alloy} mainly composed of {TAIL ~ Ni} or Al, or stainless steel 
mainly composed of
The substrate consists of a metal or { HEAD ~ an alloy } mainly composed of { TAIL ~ Ni } or Al , or stainless steel
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH