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