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(f) The furanone compound is immobilized by using an interlayer of polyacrylic acid (PAA) or polyethylene glycol (PEG) (see Figure 5). The thickness of a PEG interlayer is 2.84 nm and that of a PAA one is 2 nm. What is the inelastic mean free path (IMFP) for electrons travelling through a PEG interlayer if the electron signal is attenuated by 53%? At what angle would photoelectrons travelling through a PAA interlayer need to be measured, for them to be attenuated by the same amount? No marks will be given if no working is shown. FEP FEP Figure 5. Schematic of furanone (circle) being immobilized on (left) polyacrylic acid or (right) polyethylene glycol interlayers