SEIRA spectra with a surface-sensitivity of 10 nm, for instance, during the binding of IAV via HA glycoproteins. B: The tBLM is based on a phase-separated self-assembled monolayer of the cholestanol tether ChEO3SH and the spacer 6MH on the Au film, which is covered by a bilayer lipid membrane containing 1 mol% of the sialic acid-presenting lipid GD1a, serving as attachment factor for IAV.