The electrode assembly has {TAIL ~ an active electrode} and, set back from the active electrode, {HEAD ~ a return electrode} coated with an insulative dielectric layer 
The electrode assembly has { TAIL ~ an active electrode } and , set back from the active electrode , { HEAD ~ a return electrode } coated with an insulative dielectric layer
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH