To confirm the experimental accuracy of the 3D manifold beyond the model's training data set, solutions of monodisperse PS of molecular weights not utilized in manifold development were prepared at random polymer concentrations. These solutions were subsequently spin coated onto silicon wafers and had coverage thickness measurements taken via ellipsometry. The resulting testcase thickness values and their prediction error are shown in Table . When predicting the critical concentration of these new molecular weights and thicknesses, the 3D manifold achieves an RMSE of 1.37 and MAPE of 4.98%. These results indicate that the model achieves a similar performance on the training data points and the testing data points.