The theory of Sentinel-2A atmospheric correction

Hi all,
Now i’m using the data of Sentinel-2A, but I can’t find any information about the theory of Sentinel-2A atmospheric correction,IS it 6S radiative transfer model in theory of atmospheric correction? CAN anyone help me and tell me about it?

the different product levels are described in the Sentinel-2 manual, chapter 1.10:

You can find information about atmospheric correction in the manual of sen2cor, chapter 2.2, especially 2.2.2 onwards:

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I am not sure it is what you are searching for, but I have written some basics things about atmospheric correction in my blog. You might want to check my “How it works page” :

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