In recent years, Spatially Offset Raman Spectroscopy (SORS) has gained significant applications due to its unique and efficient capability to detect target substances concealed within strongly scattering interfering media. Extensive and profound investigations have been conducted to demonstrate the performance characteristics of SORS. However, there is a lack of a comprehensive study exploring the detection of materials with varying optical properties by SORS. This research endeavors to bridge this gap by constructing a concise bilayer model. In this model, two distinct interferents with different optical properties are layered onto the target material. Through the analysis of the Raman intensities originating from the surface interferent and the underlying target material, we investigated the SORS performance when probing substances with varying degrees of scattering. Our findings indicate that under identical detection conditions, the higher scattering surface interferent need a larger spatial offset for effective detection by SORS. Consequently, this study demonstrates the substantial potential of SORS technology in non-invasive detection applications for sublayer components. Moreover, it provides a comprehensive understanding of the SORS.