---
title: Layer
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/track_header_atom/layer
---

# Layer

A 16-bit integer that indicates this track’s spatial priority in its movie.

## Overview

Overview The QuickTime Movie Toolbox uses this value to determine how tracks overlay one another. Tracks with lower layer values are displayed in front of tracks with higher layer values.

## See Also

### Data fields

- [Size](quicktime-file-format/track_header_atom/size.md)
- [Type](quicktime-file-format/track_header_atom/type.md)
- [Version](quicktime-file-format/track_header_atom/version.md)
- [Flags](quicktime-file-format/track_header_atom/flags.md)
- [Creation time](quicktime-file-format/track_header_atom/creation_time.md)
- [Modification time](quicktime-file-format/track_header_atom/modification_time.md)
- [Track ID](quicktime-file-format/track_header_atom/track_id.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved.md)
- [Duration](quicktime-file-format/track_header_atom/duration.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved_2.md)
- [Alternate group](quicktime-file-format/track_header_atom/alternate_group.md)
- [Volume](quicktime-file-format/track_header_atom/volume.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved_3.md)
- [Matrix structure](quicktime-file-format/track_header_atom/matrix_structure.md)
- [Track width](quicktime-file-format/track_header_atom/track_width.md)