{HEAD ~ Doping} of the evaporated material is possible by evaporating {TAIL ~ doped source material} such as heavily doped silicon 
is possible by evaporating
{ HEAD ~ Doping } of the evaporated material is possible by evaporating { TAIL ~ doped source material } such as heavily doped silicon
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH