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