Our previous reports on emissivity of metasurfaces with 10-nm-thin insulator layers confirmed that their thermal radiation spectral output qualitatively follows Kirchhoff's law . However, it was noticed that thermal radiation emittance from metasurfaces was quantitatively lower than would be expected if Kirchhoff's law was rigorously obeyed, given the near-perfect antireflectance exhibited by the structure. This prompted the present study. MIM metasurfaces confine a significant portion of the resonant electro-magnetic field in the insulator layer, but a fraction of radiation energy is nevertheless localized around nanodsics and subject to scattering. Therefore, scattering effects are expected to notably effect metasurface optical response and its characterisation, and their control is vital to realization and demonstration perfect optical absorber performance. This issue was highlighted by Maccaferri et. al and a mitigation strategy by multi-layered metasurface design was proposed to spectrally separate the absorption and scattering effects .