Hmm, yes this generally what the EPlus Input-Output documentation suggests:

"...Extremely thin and/or highly conductive material layers should be neglected from the Construction rather than included because they will not contribute to the assembly’s overall thermal resistance or heat capacity. For some cases, thin and/or highly conductive materials are a serious problem for the heat transfer modeling and the values for thickness, conductivity, density and specific heat are checked for appropriateness.[...]"

In addition a few lines further on, the documentation also mentions:

"The absorptance values in this object impart surface properties to the construction and should be applied to the thermally significant inner and outer layers in the overall assembly. Attempting to trick the program by modeling thin “paint” layers to apply surface properties is not a good idea; the models were not intended to support such strategies."

I believe what this suggests, as @mdahlhausen states below, is that the construction should consist of a single material, where the surface emissivity of the material is that of the thin metal (e.g. here it would be aluminum).