We investigate magnetic and superconducting properties of layered f-electron superlattices within the fluctuation exchange approximation (FLEX). We show that spin fluctuations, which are characterized by the maximum value of the spin susceptibility in the three-dimensional (3D) Brillouin zone, are strongly suppressed in f-electron superlattices. However, effective 2D spin fluctuations can be increased due to the spatial confinement of the f electrons. Therefore the tendency towards dx2-y2-wave superconductivity, mediated by these spin fluctuations, can be strongly increased in f-electron superlattices. This is in sharp contrast to superlattices composed of conventional s-wave superconductors, where superconductivity is generally suppressed.