  The analytical expressions of liquid-vapor macroscopic contact angles are
analyzed for various simple geometries and arrangements of the substrate, in
particular when the latter exhibits two or more scales. It concerns the Wenzel
state of wetting when the substrate is completely wet, the Cassie-Baxter state
when the liquid hangs over the substrate, but also intermediate states of
wetting which are shown to be relevant and in competition with the two other
ones. Under a separation of scales hypothesis, a composition rule of contact
angles is developed whose interest is illustrated in a close packing setup of
rasperry-like particles.
