(a) Simulated reflectance and transmittance of a B270 glass slide, with and without a 1 nm thick Ag-like layer. Only a very small change in both R and T are observed. (b) Simulated reflectance of a stack with opaque Si + 800 nm SiO₂, with and without a 1 nm thick Ag-like layer. Compared to (a), a much more dramatic shift in the reflectance spectrum is seen when the Ag layer is added.