In order to translate the measured ∆𝐴 𝐴 ! ⁄ and ensemble anisotropy data into a quantitative measure of the orientational order, we developed an expression that predicts ∆𝐴 𝐴 ! ⁄ , in terms of (1) the intrinsic anisotropy of the absorbing species and (2) the degree of field-driven macroscale ordering. The absorber could be an individual isolated NR or a self-assembled NR bundle. Our model simply assumes an arbitrary emitter/absorber with an intrinsic optical dipole.