For the crystal structure of bulk C60, there are reports with sc and fcc arrangements:

Article Crystal Structure and Bonding of Ordered C60

Article Electronic Structure of Crystalline Buckyballs: fcc-C60

Both of these structures in principle involve squares, so observing a sqare as the final arrangement is rather intuitive. In this early work you actually see them forming squares in fig. 2:

Article Growth of C60 films on silicon surfaces

If you want more of that, just search for "epitaxial C60 growth".