The first term represents the intrinsic isotropic component, corresponding to reciprocal lightmatter interactions. The second term, referred to as apparent circular dichroism (ACD), accounts for the interference between linear dichroism (LD) and linear birefringence (LB), with LD' and LB' referring to the 45-degree orientations relative to a chosen axis of LD and LB, respectively, and for this reason it is also referred to as LDLB effect. This nonreciprocal term arises from the preferential orientation of mesoscopic domains and is influenced by the material's directional anisotropy and how the material is processed. The material used in this work is based on a chiral phenylene bisthiophenylpropynone (PTPO) derivative, whose films, spin-coated from CH 2 Cl 2 solutions and thermally annealed, displayed nearly mirror-image CD spectra when illuminated from the front or back, as shown in the Fig. , where the CD ranges from 0.02 to 0.06 (∆A) across the laser emission regime, corresponding to a dissymmetry g-factor (g abs = CD/Absorbance) of around 0.07 to 0.2. The thin films have a thickness of approximately 300 nm.