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