Subsequent layers are spun onto the top surface of prior layers and exposed, and upon completion of the succession of layers {HEAD ~ each} defining {TAIL ~ corresponding levels} of the desired structure, the layers are all developed at the same time leaving the three dimensional structure 
Subsequent layers are spun onto the top surface of prior layers and exposed , and upon completion of the succession of layers { HEAD ~ each } defining { TAIL ~ corresponding levels } of the desired structure , the layers are all developed at the same time leaving the three dimensional structure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH