A second laminate comprises {HEAD ~ second interlayer dielectric films} having {TAIL ~ a mechanical strength} higher than the first mechanical strength 
A second laminate comprises { HEAD ~ second interlayer dielectric films } having { TAIL ~ a mechanical strength } higher than the first mechanical strength
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH