Electromagnetic (EM) scattering from thin coating on conducting objects is a classic topic that arises in many practical application. The complexity of absorbing material application demands for sophisticated and flexible numerical methods. It can be argued that these requirements are even more critical when the cost of building and measuring a real coated object is great. Usually, impedance boundary condition (IBC) is used to model the behavior of the coating structure. The simplest and most popular IBC is the well-known Leontovich's IBC. This boundary condition links the tangential components of the electric field to those of the magnetic field on the outer surface of the object and avoids the solution of the functions inside the inhomogeneous domain. It provide an effective way to simplify the analytical or numerical solution procedure. At present, different IBCs are frequently used in combination with the surface integral equation (SIE) method.
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