Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
Axial (or apical) and equatorial positions. Trigonal bipyramidal molecular shape. ax = axial ligand (on unique axis) eq = equatorial ligand (in plane perpendicular to unique axis) The five atoms bonded to the central atom are not all equivalent, and two different types of position are defined.