In the preferred embodiment of the invention, the thickness of at least one interlayer is in the range of {HEAD ~ about 1 μm} to {TAIL ~ 20 μm} and the total thickness for each of the other interlayers is at least 10 Å 
to
In the preferred embodiment of the invention , the thickness of at least one interlayer is in the range of { HEAD ~ about 1 μm } to { TAIL ~ 20 μm } and the total thickness for each of the other interlayers is at least 10 Å
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH