We use the effective band structure (EBS) to interpret the conduction band electronic structure of the alloys. The EBS is obtained by unfolding the SQS supercell bands to the primitive cell Brillouin zone using spectral decomposition. Each eigenstate in the primitive cell is assigned a spectral weight that represents how well the Bloch character of that eigenstate has been preserved when unfolded from the supercell wavefunctions. The spectral weight is defined by: