Definition of atop preposition from the Oxford Advanced Learner's Dictionary

 

atop

 preposition
preposition
BrE BrE//əˈtɒp//
 
; NAmE NAmE//əˈtɑːp//
 
(especially North American English)
 
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(old-fashioned or literary in BrE) on top of; at the top of a flag high atop a pole a scoop of ice cream atop a slice of apple pie The children piled atop one another in the sand. Fruit and vegetable prices rose 1.3 per cent atop a 2 per cent gain last month. Coca-Cola is atop the list of best-selling soft drinks in the US.
See the Oxford Advanced American Dictionary entry: atop