The islands have {TAIL ~ a conductivity} that is substantially greater than {HEAD ~ the conductivity} of the resistive layer 
The islands have { TAIL ~ a conductivity } that is substantially greater than { HEAD ~ the conductivity } of the resistive layer
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH