{TAIL ~ The total thickness} of {HEAD ~ each interlayer} can be in the range of about 5 Å to 20 μm 
{ TAIL ~ The total thickness } of { HEAD ~ each interlayer } can be in the range of about 5 Å to 20 μm
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH