An Involution on Involutions and a Generalization of Layered   Permutations
  Taking transposes of Standard Young Tableaux defines a natural involution on the set $I(n)$ of involutions of length $n$ via the the Robinson-Schensted correspondence. In some cases, this involution can be defined without resorting to the Robinson-Schensted correspondence. As a byproduct, we get an interesting generalization of layered permutations. 
Miklos Bona and Rebecca Smith
math.CO