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it's hard to describe without a graph- but let me try

#1- flat one coin on the table;
_

#2- holding 2 coins- face to face with your left hand- verticlly

#3- holding 2 coins- face to face with your right hand - verticlly

incline #2 coins ~20-40 degrees toward you
incline #3 coins ~20-40 degrees away from you
#2 coins 'kiss'#3 coins on their edges

sit #2 and #3 on #1


no sure if there are better solutions..this solution assumes coin thickness =0...