Subnormality in ω12

A space X is said to be subnormal (=δ-normal) if every pair of disjoint closed sets can be separated by disjoint Gδ-sets. It is known that the product space (ω1+1)×ω1 is neither normal nor subnormal, moreover the subspace A×B of ω12 is not normal whenever A and B are disjoint stationary sets in ω1. We will discuss on subnormality of subspaces of ω12.