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Does anyone know the equation for converting Sentinel 2 level 1c products from reflectance to TOA radiance?

I've looked at the Sentinel user guides but can't find anything. I'd rather use ArcGIS than SNAP, if possible.

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I've actually just found the equation on the ESA SNAP help section under 'reflectance to radiance algorithm specification'.

If anyone else needs it, I used the following:

radiance = ((pixelValueBandX * cos(incidenceAngle) * solarIrradianceBandX) / (pi * d2)) / 10000

where d2 is 1.0/U

values for incidenceAngle, solarIrradianceBandX and U can be found in the 2 metadata files included in the download.

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