A second dopant zone with a doping of {HEAD ~ a second conductivity type} is formed in {TAIL ~ a second region} of the semiconductor layer 
A second dopant zone with a doping of { HEAD ~ a second conductivity type } is formed in { TAIL ~ a second region } of the semiconductor layer
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH