The oxide layer 22 has a thickness, for example, in a range of {HEAD ~ 1000 angstroms} to {TAIL ~ 8000 angstroms} 
to
The oxide layer 22 has a thickness , for example , in a range of { HEAD ~ 1000 angstroms } to { TAIL ~ 8000 angstroms }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL