What layer of the atmosphere would altostratus clouds be in?

Altostratus clouds are typically found in the mid-level of the atmosphere, specifically within the altostratus cloud category. They usually form at altitudes between 6,500 and 20,000 feet (2,000 to 6,000 meters). These clouds are characterized by their gray or blue-gray appearance and can cover the sky, often indicating that precipitation may occur.