It will be appreciated that {TAIL ~ a thermal evaporation system} may be employed instead of {HEAD ~ the electron beam evaporation system} 
It will be appreciated that { TAIL ~ a thermal evaporation system } may be employed instead of { HEAD ~ the electron beam evaporation system }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD