Magnetic dynamics of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">NiPS</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

NiPS${}_{3}$ is a layered van der Waals compound. Like graphite, it can be delaminated down to monolayer. Unlike magnetic. Neutron inelastic scattering has been performed on bulk single-crystal samples of measure the magnetic dynamics, key understanding properties. Clear spin waves are observed, quantifying exchange within and between layers predominantly planar anisotropy. The findings have important ramifications for in graphene-based research.