Pls tell me,how can neji overcome amaterasu?
Specifically only MS Amaterasu can't overcome the Hyuga because it can't be spammed.
First of all, the Byakugan can deduce by looking at the sharingan eye knowing what to come, we all know that Byakugan are superior than sharingan in term of insight. The Hyuga advantage have nearly 360 vision, telescopic vision, long-range vision, and chakra sensory capabilities.
The Byakugan grants it's user the ability to read and detect it's surroundings much faster than a regular eye, which would make it much easier to spot Amaterasu coming. Once Amatersu been casted, they would use Heavenly Rotation which works in a similar fashion to Almighty Push, would be capable of stopping Amaterasu. Heavenly Rotation forms a high-speed dome of chakra around the user.
It was stated that Amaterasu doesn't disappear until it burns it's original target. This means that if Amaterasu were to hit the armor, it would burn the chakra away and then disappear, to which then a hyuga could replace the burned hole with more chakra.
Anyway, the Amatersu won't able to come close to the opponent , Hyugas are capable of having a layer of chakra, the rotation has enormous field radius and it's considered to be one of the strongest defence even surpassed Gaara sand defence.
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The only problem with rotation is that it cannot last long to spin which at most it spin at 30+ second, but the same thing to Amaterasu as it can't be spammed if you're on MS or else you go blind.