In a large mixing bowl, combine boiling water, oats, 1/2 cup honey, butter and salt. Let stand for 1 hour. In a small bowl, dissolve yeast in warm water. Let stand until creamy, about 10 minutes. Pour the yeast mixture into the oat mixture. Add 2 cups of flour; mix well. Stir in the remaining flour, 1/2 cup at a time, beating well after each addition. When the dough has pulled together, turn it out onto a lightly floured surface and knead until smooth and elastic, about 20 minutes. Lightly oil a large bowl, place the dough in the bowl and turn to coat with oil. Cover with a damp cloth and let rise in a warm place until doubled in volume, about 1 hour. Deflate the dough and turn it out onto a lightly floured surface. Divide the dough into two equal pieces and form into loaves. Place the loaves into two lightly greased 9x5 inch loaf pans. Cover the loaves with a damp cloth and let rise until doubled in volume, about 40 minutes. Preheat oven to 350 °F. Bake at 375 °F for about 30 minutes or until the top is golden brown and the bottom of the loaf sounds hollow when tapped. Remove loaves from pans, brush tops of loaves with 2 tablespoons honey and sprinkle with oats.