It's considered a professional courtesy, as is providing adequate severance. If you work at a place that doesn't give severance, I wouldn't necessarily give two

It's considered a professional courtesy, as is providing adequate severance. If you work at a place that doesn't give severance, I wouldn't necessarily give two weeks notice. But there is some law about notice. The WARN Act covers large employers who are conducting large layoffs. They have to give 60 days notice of large layoffs 50-500 depending on work site size and other factors.