Then {HEAD ~ at least one metallic layer} is sprayed on {TAIL ~ the laser shock peened surface area} of the substrate 
is sprayed on
Then { HEAD ~ at least one metallic layer } is sprayed on { TAIL ~ the laser shock peened surface area } of the substrate
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH