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