Abstract The fluctuation-enhanced conductivity measured on YBCO-PrBCO superlattices (SL) is analysed using various theoretical models describing weak fluctuations in layered superconductors and considering both Aslamazov-Larkin(AL) and Maki-Thompson(MT) terms. From the analysis ξ c (0)=0.16±0.01 nm and τφ(100K) ≅3∗10 −? s in clean limit are derived for the intralayer coherence length and temperature dependent phase-relaxation time respectively. Large τφ values and AL-MT crossover revealed for all samples studied are attributed to evident 2-dimentional (2D) nature of electronic state of SL above the crossover temperature. The resonating-valence-bond (RVB) model is used to discuss intralayer interaction in 2D fluctuation region.