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Well it actually varies. Karitiana , Surui who are Amazonian tribes are 100% Amerindian and they are around 25-30% West Eurasian. On the other hand, other Native Americans such as Mayans, Peruvians can be around 35-50% West Eurasian as they often have slight Euro admixture although they are still predominantly Native genetic wise (something like 78-85% Amerindian).
This PCA gives a good idea of where Amerindians would cluster in terms of Eurasian global context
https://postimg.org/delete/cqxvlknhs/ (I can't put it in the image format for some reason)
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