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The relationship of the microwave power (P) in Eq. [1] and Eq. [2] with the penetration depth (dp) Eq. [4]. The decay curve obeys the Beer-Lambert-Bouguer's law: The attenuation factor (α) in Eq. [2] determines the slope of the curve, which is dependent on ε* in Eq. [3], the complex relative permittivity.
