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To apply a bottom border exclusively in Jetpack Compose, use the Modifier.border() function with the following parameters:

• width: The width of the border.
• color: The color of the border.
• shape: The shape of the border, which can be either RectangleShape or RoundedCornerShape.

To apply a bottom border, set the border modifier with BorderStroke to the View, with size parameter describing the width of the border:

Box(modifier = Modifier
    .height(100.dp)
    .width(100.dp)
    .border(border = BorderStroke(2.dp, Color.Red), shape = RectangleShape, shapeAppearance = null))

This will add a border with a width of 2dp and a red color to the bottom of the view.