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