Figure 4: Charge distributions of monolayer 2H-MoS2.
From: Origin of Structural Transformation in Mono- and Bi-Layered Molybdenum Disulfide

Isosurface (0.003 e/Å3) of the charge distributions of 2H-MoS2 doped with (a) 0.25, (b) 0.75, (c) 1.00 e/f.u., (d) Li and (e) Na on monolayer 2H-MoS2. The red and green surfaces correspond to charge gains and loss of charge, respectively.