The metal may be in {HEAD ~ the form} of {TAIL ~ a particulate metal} or atomically dispersed metal or both 
of
The metal may be in { HEAD ~ the form } of { TAIL ~ a particulate metal } or atomically dispersed metal or both
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH