<p>In this paper, dyadic Green’s function for a surface impedance-coated perfect electromagnetic conductor (PEMC)-backed slab is formulated using dyadic Green’s function. The formulation is based on the scattering superposition method, considering the impact of boundary reflections inside the slab, mode coupling due to the PEMC boundary, and surface current due to the surface impedance boundary. For this purpose, the electromagnetic fields are represented in terms of the orthogonal basis functions with unknown coefficients, which are then extracted by enforcing the appropriate boundary conditions at the surface impedance and PEMC interfaces. Perfect electric conductor (PEC)-backed and perfect magnetic conductor (PMC)-backed dielectric slabs with surface impedance coating are treated as the special case of the solution by relaxing the electromagnetic coupling due to the PEC interface and, respectively, considering the vanishing tangential electric and magnetic field at the interface. The formulation is verified by comparing the results with previously known formulas for a dielectric slab. Various guided and radiating devices can be designed based on the proposed model by manipulating the surface impedance and PEMC interface parameters.</p>