The positively charged mobile ions drift away from {HEAD ~ the positively biased film interface} and toward {TAIL ~ the negatively biased film interface}, causing capacitance voltage shifts 
The positively charged mobile ions drift away from { HEAD ~ the positively biased film interface } and toward { TAIL ~ the negatively biased film interface } , causing capacitance voltage shifts
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH