For the single molecule strong coupling case, one often has to control the molecular orientation with respect to the cavity field polarization direction in order to see polaritonic effects on chemistry. For example, recent theoretical work suggests that only when coupling to the cavity along particular electric field directions, one can selectively obtain the endo-or the exo-products of a Diels-Alder reaction, 20 whereas an isotropic random orientation of the molecule will likely end up giving an equal mixture of both isomers, a situation similar to that obtained outside the cavity. Experimentally, it has been shown for a single molecule-NPoM cavity system that controlling the molecular orientation to align the molecule with the cavity field is possible. Nevertheless, perfectly controlling the molecular orientation in all cases is exceptionally challenging.