In Fig. , we see that with an increase in dipole orientation disorder σ θ , the effective Rabi-splitting decreases until it converges to a specific Ω R . The convergence is reached around a disorder of σ θ = 90 • . This can be interpreted as follows. For a HTC model Hamiltonian under the condition ℏω c = ε = ε, the polariton energies can be expressed as ε