Preheat oven to 425°.
Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, granulated sugar, baking powder, and salt in a bowl; cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal. Add 2/3 cup milk; stir just until moist.
Turn dough out onto a heavily floured surface; knead lightly 5 times. Roll dough into a 10 x 7-inch rectangle on a lightly floured surface. Spread marmalade to within 1/2 inch of edges.
Beginning at long side, roll up dough tightly, jelly roll fashion; pinch seam to seal. (Do not seal ends of roll.) Cut roll into 9 slices. Place slices, cut sides up, in an 8-inch square baking pan coated with cooking spray.
Bake at 425° for 22 minutes or until golden. Remove biscuits from pan, and place on a wire rack.
Combine powdered sugar and 2 teaspoons milk in a small bowl; stir until smooth. Drizzle over warm biscuits. Serve immediately.