For example, the operating parameter could be adjusted to achieve a desired difference between the measured anisotropy of the first surface and {HEAD ~ the measured anisotropy} of {TAIL ~ the second surface} 
For example , the operating parameter could be adjusted to achieve a desired difference between the measured anisotropy of the first surface and { HEAD ~ the measured anisotropy } of { TAIL ~ the second surface }
OTH OTH OTH 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 TAIL