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