  RV6Sn6 (R = Y and lanthanides) with two-dimensional vanadium-kagome surface
states is an ideal platform to investigate kagome physics and manipulate the
kagome features to realize novel phenomena. Utilizing the micron-scale
spatially resolved angle-resolved photoemission spectroscopy and
first-principles calculations, we report a systematical study of the electronic
structures of RV6Sn6 (R = Gd, Tb, and Lu) on the two cleaved surfaces, i.e.,
the V- and RSn1-terminated (001) surfaces. The calculated bands without any
renormalization match well with the main ARPES dispersive features, indicating
the weak electronic correlation in this system. We observe 'W'-like kagome
surface states around the Brillouin zone corners showing R-element-dependent
intensities, which is probably due to various coupling strengths between V and
RSn1 layers. Our finding suggests an avenue for tuning electronic states by
interlayer coupling based on two-dimensional kagome lattices.
