Each side may also have {HEAD ~ a height} between about 5 μm and {TAIL ~ about 15 μm} 
between
Each side may also have { HEAD ~ a height } between about 5 μm and { TAIL ~ about 15 μm }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL