Soak sun-dried tomatoes in hot water and drain. Repeat process.
Saute garlic in olive oil in a large sauce pot. When garlic browns lightly, stir in sun-dried tomatoes, basil, oregano and heavy cream. Bring mixture to a simmer; mix in 1 cup of Romano cheese. Stir in arrowroot to thicken sauce.
Layer 1/3 of sliced potatoes, 1/3 of Mozzarella cheese, 1/3 cup Romano cheese and 1/3 of cream mixture in a lightly greased 2" hotel pan.
Repeat process twice more, finishing with final 1/3 of cream mixture. Season with salt and pepper if desired.
Bake at 325° F in a convection oven for approximately 1 hour, or until potatoes are tender.