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