Blocking the buzz: MXene composite could eliminate electromagnetic interference by absorbing it

It's half-baked nonsense. It talks about absorbing electromagnetic waves, but doesn't say anything specific about the proportion absorbed per unit depth of the absorbing layer. The closest it gets to a unit of thickness is "thinner than a human hair"

"A thin coating of the vanadium-based MXene material -- less than the width of a human hair -- could render a material impermeable to any electromagnetic waves in the X-band spectrum, which includes microwave radiation and is the most common frequency produced by devices."

The average thickness of a human hair is 70 micron, but it varies by +/-20 micro from person to person.

The X-band is equally loosely specified " In radar engineering, the frequency range is specified by the Institute of Electrical and Electronics Engineers (IEEE) as 8.0–12.0 GHz. The X band is used for radar, satellite communication, and wireless computer networks."

You'd need remarkably fast logic to get edge speeds with an appreciable 10GHz component.

"Consumer microwave ovens work around a nominal 2.45 gigahertz (GHz)—a wavelength of 12.2 centimetres (4.80 in) in the 2.4 GHz to 2.5 GHz ISM band—while large industrial/commercial ovens often use 915 megahertz (MHz)—32.8 centimetres (12.9 in)" which is below the X-band.