The method 2 further including the step of maintaining {HEAD ~ a negative bias} with {TAIL ~ respect} to the first electrode and a positive bias with respect to the second electrode 
with
The method 2 further including the step of maintaining { HEAD ~ a negative bias } with { TAIL ~ respect } to the first electrode and a positive bias with respect to the second electrode
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH