Chop nuts and toss with cinnamon. Set aside. Unroll phyllo dough. Cut whole stack in half to fit pan. Cover phyllo with a dampened cloth to keep from drying out as you work. Place two sheets of dough in pan, butter thoroughly. Repeat until you have 8 sheets layered. Sprinkle 2 - 3 tablespoons of nut mixture on top. Top with two sheets of dough, butter, nuts, layering as you go. The top layer should be about 6 - 8 sheets deep.