ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping.Voxel Namespace / SliceDefinition Class / Layer Property
Example Version

Layer Property (SliceDefinition)
Gets the voxel layer with which the slice is associated.
Syntax
public VoxelLayer Layer {get;}
Example
Get Voxel Layer for the Selected Slice in TOC
//Must be on the QueuedTask.Run()

VoxelLayer voxelLayer = null;
var slice = MapView.Active?.GetSelectedSlices()?.FirstOrDefault();
if (slice != null)
{
    voxelLayer = slice.Layer;
    //TODO - use the layer
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also