ILayerUserConfig

interface ILayerUserConfig extends CommonDisplayableConfig {
    /**
     * The z-index of the layer, higher z-index will be rendered on top of the lower z-index, allows negative values.
     *
     * **Note**: the default background layer has a z-index of -1, and the default displayable layer has a z-index of 0.
     */
    zIndex: number;
}