Since the crosslinking is stronger at the top and the dissolution rate is quicker at the bottom, {HEAD ~ the developing process} 22 forms {TAIL ~ the polyimide isolating wall} 36 with a reverse trapezoid cross section 
forms
Since the crosslinking is stronger at the top and the dissolution rate is quicker at the bottom , { HEAD ~ the developing process } 22 forms { TAIL ~ the polyimide isolating wall } 36 with a reverse trapezoid cross section
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH