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