Explicit compactifications of moduli spaces of Campedelli and Burniat surfaces

We describe explicitly the geometric compactifications, obtained by adding slc surfaces $X$ with ample canonical class, for two connected components in the moduli space of surfaces of general type: Campedelli surfaces with ${\pi }_1(X)={\mathbb{Z}}_2^3$ and Burniat surfaces with $K^2=6$.