Comment on: “Experimental and Theoretical Investigations of Tetrakis (Thiourea) Palladium Chloride Semi-Organic Non-Linear Optical Crystal: An Approach to NLO Application” [(2018) Silicon 10 (3):841–850]

In a recent paper [(2018) Silicon 10 (3):841–850] Rajagopalan et al. studied the physical properties of the Tetrakis (Thiourea) Palladium Chloride Semi-Organic Non-Linear Optical Crystals. The authors have used a wrong approach to calculate the reflectance spectra of the samples and obtained values of this parameter are incorrect. Consequently, other reported optical parameters in the commented paper that are calculated based on the reflectance such as refractive index and dispersion parameters evaluated from the Wemple-Didomenico single oscillator model are wrong.