The orientationally disordered phase of the two-dimensional hard cyclic pentamer system has been studied by Monte Carlo simulations. Various structural quantities have been calculated at several densities. The singlet distribution function, studied in detail, reveals considerable coupling between translational and rotational molecular motions. The coupling, stronger at higher densities, is present also at lower densities, down to melting, and cannot be neglected in any structural analysis of the system. An orientational transition connected with a change observed in the translational-orientational coupling is suggested.