As with the refractory metal in {TAIL ~ the first coating}, the metal, if present, may be in {HEAD ~ the form} of particulate metal or atomically dispersed metal or both 
As with the refractory metal in { TAIL ~ the first coating } , the metal , if present , may be in { HEAD ~ the form } of particulate metal or atomically dispersed metal or both
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH