Adjusting the operating parameter could be based on a difference between {HEAD ~ a measured anisotropy} of {TAIL ~ the first surface} and a measured anisotropy of the second surface 
of
Adjusting the operating parameter could be based on a difference between { HEAD ~ a measured anisotropy } of { TAIL ~ the first surface } and a measured anisotropy of the second surface
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