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