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Distortion of THz substance spectrum by transparent disordered cover

The interaction of a few-cycle pulse with a substance, described in terms of density matrix formalism, is investigated numerically. The influence of disordered layered structure, covering the substance, is studied. The material of disordered structure is assumed to be linear and is described in terms of classic electrodynamics. The appearance of additional spectral features, unrelated to the substance material, is demonstrated.