When ordered, a balance between the physics that determines the bulk block copolymer morphology and the physics that determines the substrate surface interfacial interactions results in {HEAD ~ a thermodynamically stable complex three dimensional film} that varies in a direction perpendicular to the substrate and has {TAIL ~ a morphology} that differs from its bulk morphology 
has
When ordered , a balance between the physics that determines the bulk block copolymer morphology and the physics that determines the substrate surface interfacial interactions results in { HEAD ~ a thermodynamically stable complex three dimensional film } that varies in a direction perpendicular to the substrate and has { TAIL ~ a morphology } that differs from its bulk morphology
OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH