{HEAD ~ A semiconductor layer} with a doping of {TAIL ~ a second conductivity type} is applied at a surface of the semiconductor substrate 
{ HEAD ~ A semiconductor layer } with a doping of { TAIL ~ a second conductivity type } is applied at a surface of the semiconductor substrate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH