An STM study of C-70 (sub-)monolayers deposited at an n-tetradecane/Au(111) interface (see Figure) is reported. The adsorption Of C-70 and C-60 are compared in the light of their geometric and electronic differences. While C-60 is a strained spherical cage, C-70 has a reduced symmetry and an ellipsoidal shape. The structural differences between the C-60 and C-70 (sub-)monolayers are discussed in terms of commensurability between the adsorbate and the Au(111) lattices.