Supporting Information: Best practices in measuring absorption at the macro- and microscale

Supporting information for the main text containing: - List of algebraic terms used - Beam paths for experimental setups - Description of how to use glass as a reference material - Discussion of camera heating effects - Example of spectrometer output - Comparison of experimental and modelled data for a thin monocrystalline gold flake - Scanning electron microscopy images of gold nanodisks - Description of fitting process for absorption maps