I am not sure about this point that glazing has no absorbance. Would you mind to illustrate this? IF we consider a single pane glass for glazing it has all three , transmittance, reflection and absorption.
Glazing , I mean as a glass pane having no frames. Glazing having frames are considered as window.
There is actually not much more to say (Thanks Peter!). A= -log10(P) where P is the propagation inside a medium given by P = I/I0 would be compatible with Maxwell's equations, where I is the irradiance after a distance d and I0 the irradiance at the starting point. Things come closer to Absorbance if you ratio T by T0 where T is the transmittance with solute and T0 is the transmittance of pure solvent, i.e. A= -log10(T/T0). In cases where you have a pure material, there is no way if you want to avoid potentially large errors other than to use Abeles formalism or the related simplifications for varying layer thicknesses (in case you don't have interferences in your spectra) etc.
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