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Preheat oven to 350* (F).
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Spread butter or margarine on bottom and sides of 8-inch square pan.
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In mixing bowl, combine flour, 2/3 cup sugar, 4 Tbsp.
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cocoa, baking powder, cinnamon, coffee powder, and salt.
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Stir slowly until blended.
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Stir in milk, oil, and vanilla.
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Spoon batter into prepared pan, and smooth out until evenly distributed.
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In a small bowl, stir together remaining 2 Tbsp.
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cocoa and 2/3 cup sugar.
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Spread this mixture evenly over batter in pan.
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On top of this, pour boiling water.
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Do NOT stir.
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Carefully set pan in preheated oven on middle rack, and bake for 35 minutes, or until top looks crisp and crackled and cake tester inserted into a cakey area comes out clean.
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Cool for a few minutes.
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Serve warm, directly from pan.