FN-2HDM: Two Higgs Doublet Models with Froggatt-Nielsen Symmetry
  We embed Two Higgs Doublet Models (2HDMs) in the Froggatt Nielsen (FN) framework. We find that the approximate FN symmetry predicts i) approximate Natural Flavor Conservation (NFC) of Types II or IV in the Yukawa sector, and ii) approximate Peccei-Quinn (PQ) symmetry in the scalar sector. We discuss the phenomenological consequences of these features. 
Avital Dery and Yosef Nir
hep-ph