To address this shortcoming, we designed an experimental platform consisting of a designed "artificial interphase" with tunable interphase thickness. Figure shows how a rigid plastic material supports three polymer layers: the glassy layer representing a substrate (S), the tunable/variable thickness interphase layer (I), and the bulk matrix polymer layer (M). Using this well-defined system, we measure the mechanical properties across the interphase with probes of different -but known -radius. We apply dimensionless analysis to model the indentation mechanics across different length scales and thus establish a framework for interphase thickness prediction. Finally, we discuss the lower limit of interphase resolution. In this new framework, the key value which characterizes the modulus distance profile is the ratio between interphase thickness and contact radius of tip. We used this relationship to evaluate the results from previous work and also applied it for quantitative interphase measurement on our model systems. Our findings validate this new approach to quantify the mechanical properties of the interphase in heterogeneous soft materials.