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will chrome-plating be the solution? to bounce the beam away

There is a much smaller solution than that, and portable too.

I spend a lot of time most winters messing with electronics, making amplifiers and such things.
https://www.techwalla.com/articles/how-to-make-a-frequency-jammer

You would need to make it variable frequency or find the exact frequency being used.

https://electronicsforu.com/electronics-projects/build-cell-phone-jammer

Parts available even on eBay.

Don't think that a batterypowered jammer can do much against a megawatt beam of directed energy.

Just emailed hollywood if they have a few of those outfits that are obsolete.. :-)

You have to upscale and think bigger my friend, match force with force, and may the force be with you Luke. :-)

Hmmm how many musk-mobile bat-erries do we need for that?

W e shall think bigger, and go for gigawatts, now where is that old lunatic ffom back to the future at again?.........................

He has the damn flux capacitor design, mug him man for gawds sake, get them plans by hook or by crook my friend.